I buy mine from here:
Swarovski Crystal Charms, Hot Fix Rhinestones, Swarovski Pearls Wholesale - Rhinestoneshop.com
2mm hot-fix cost $6.99 for 144 stones.
If you’re buying hot-fix you will also need to buy an applicator that is basically like a solder-iron (a metal rod that heats up) - I wouldn’t advise using a regular iron with these if you want to apply them properly.
I have to say that this is why his clothes are more expensive too, for example that bridal (although I need to have a word with him about that because I think he might be under the impression that people will bargain on bridals so set the price higher) has thousands of swarovski’s and they don’t come cheap. other designer’s claim to use swarovski’s but if they really did, their clothes would be a lot more expensive. you can get plenty of different grades of crystal, some coming very cheap so unless the buyer is savvy in this respect, they wouldn’t know the difference.